Police announced Monday they had made an arrest in the case of the disappearance of a Calgary boy and his grandparents and that murder charges were pending. Events in the case have included:

June 30: Calgary police issue an Amber Alert after five-year-old Nathan O'Brien and his grandparents, Alvin and Kathryn Liknes, are reported missing. Police say Nathan's mother had dropped her son off at the Liknes home the night before for a sleepover. She found all three family members missing when she went to collect him the next day. Police describe all three disappearances as "suspicious."